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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3833c1319c16c7fd98b913d4d57b455b1199f6070e30154b467bf23030bd573' 
  AND token = 'fO002X2KJ6/cEyiBJIWCfuXFKao4ybrGKV7tMK4Iu80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}